3D Printing Of Porous Ceramics Based On Organic Mesh Frame Sheet

Porous ceramics are widely used in various engineering fields because of their large number of porous structures.According to the different application requirements,the porosity,pore size,structure and strength of porous ceramics also have different requirements,so different manufacturing processes will be produced according to their application requirements.Due to the continuous development of porous ceramics,the processing technology of traditional porous ceramics cannot meet the growing demand.Therefore,3D printing technology with complex modeling ability,high efficiency processing ability and personalized customization ability has been applied to the manufacturing of porous ceramics.3D printing process for porous ceramics based on organic mesh frame sheets is proposed for the first time.In this process,the existing organic mesh is used as the framework,and the ceramic slurry is evenly adhered to the organic mesh by tape casting,and the green sheet is obtained after drying.At the same time,the computer model is established according to the target shape,and the sheet data is obtained by layering.Laser cutting the dried green sheet according to the layered data,and then bonding and superimposing layer by layer,so as to obtain the target green body.Porous ceramics can be obtained by sintering.The slurry with solid content of 75 wt%was prepared by using 100/cm~2 nylon mesh as the framework,alumina particles as the raw material of ceramics and sodium carboxymethyl cellulose as the binder.Through experiments on solid content,sheet forming process,laser cutting power and rate,sheet superposition binder and post-treatment pressure,the feasible process route was finally determined.Porous ceramics with regular pore structure were prepared by this process.Porous ceramics with different porosity,strength and structure can be prepared by changing the mesh density and feed rate.The pore structure rule is controllable and the effect of pore on compressive strength of ceramics is experimented.The organic grid material is used as the sheet skeleton to dispel the glue during sintering process,thus leaving the pore structure.Due to the structural characteristics of existing grid materials,the same pore arrangement and fixed shape can be obtained after sintering.This process can adjust and control the grid structure of organic matter,so as to control the pore structure of porous ceramics.Therefore,the results of this study have guiding significance for the development of 3D printing technology of porous ceramics.